What is the S-coefficient in Magnus Effect?

AI Thread Summary
The Magnus Effect formula involves the relationship between fluid velocity, angular velocity, and the air resistance coefficient (S). The value of S is not fixed; it varies based on factors such as temperature, pressure, viscosity, and surface roughness. To determine S, empirical measurements are typically required. In specific sub-fields, tables of values for S may be available for reference. Accurate calculations of the Magnus Effect necessitate understanding these variables.
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Hello,
I am studying Magnus Effect for the first time, I would like some help here, please.

The formula for Magnus effect as shown was:

[F][/m] = S (v × ω)

Where v = velocity of fluid,
ω = angular velocity,
S = air resistance coefficient across the surface of sphere.

How can I find the value of S? Is it fixed or does it need another formula?

Thank you for your help in advance. :)
 
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You pretty much have to measure it.
It depends on things like the temperature, pressure, viscosity and constituents of the fluid and the roughness of the surface.

Within narrow sub-fields there will be tables of values.
 
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